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Structure of the cephalic end of two little-known oxyuroid genera, Travnema Pereira, 1938 and Cosmoxynemoides Travassos, 1949, parasites of fishes, as revealed by SEM

Published online by Cambridge University Press:  05 June 2009

F. Moravec ,
A. Kohn  and
B.M.M. Fernandes
F. Moravec
Affiliation:
Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 37005 Ceské Budějovice, Czech Republic
A. Kohn
Affiliation:
Instituto Oswaldo Cruz and CNPq, C.P. 926, Rio de Janeiro, RJ, 20001, Brazil
B.M.M. Fernandes
Affiliation:
Instituto Oswaldo Cruz and CNPq, C.P. 926, Rio de Janeiro, RJ, 20001, Brazil
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Abstract

The cephalic end of the type species of pharyngodonid genera Travnema and Cosmoxynemoides, T. travnema Pereira, 1938 and C. aguirrei Travassos, 1949, parasites of Brazilian freshwater fishes, was studied by scanning electron microscopy. The mouth aperture of Travnema was found to be circular, surrounded by four cephalic papillae and two lateral amphids and the cuticle of the cephalic end had a conspicuous dense sculpture. On the other hand, the mouth aperture of Cosmoxynemoides was triangular, surrounded by three lip-like elevations covering the whole surface of the relatively flat cephalic extremity, each with two inner lobes separated one from another by a short groove; the lip-like elevations bore four medium-sized, kidney-shaped cephalic papillae and two minute amphids (two papillae on the dorsal elevation and one papilla and one amphid on each of two ventrolateral elevations); the cuticle of the cephalic end was smooth. Both species were noted for the absence of oral lamellae and the presence of lateral alae. Both genera are listed in the family Pharyngodonidae but Travnema (and also Hakynema), due to its morphological peculiarities, is considered to represent a distinct subfamily Travnematinae within the Pharyngodonidae. The finding of both T. travnema and C. aguirrei in the characid fish Astyanax bimaculatus lacustris represents new host records.

Type
Research Papers
Information
Journal of Helminthology , Volume 68 , Issue 4 , December 1994 , pp. 319 - 322
Copyright
Copyright © Cambridge University Press 1994

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